linux-kernel - Re: [PATCH 01/28] mfd: Add Microchip ZL3073x support

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Message-ID: <CAHp75Vc0p-dehdjyt9cDm6m72kGq5v5xW8=YRk27KNs5g-qgTw@mail.gmail.com>
Date: Mon, 14 Apr 2025 17:13:10 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Ivan Vecera <ivecera@...hat.com>
Cc: Andy Shevchenko <andy@...nel.org>, netdev@...r.kernel.org, 
	Michal Schmidt <mschmidt@...hat.com>, Vadim Fedorenko <vadim.fedorenko@...ux.dev>, 
	Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>, Jiri Pirko <jiri@...nulli.us>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Prathosh Satish <Prathosh.Satish@...rochip.com>, Lee Jones <lee@...nel.org>, 
	Kees Cook <kees@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH 01/28] mfd: Add Microchip ZL3073x support

On Mon, Apr 14, 2025 at 5:10 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Mon, Apr 14, 2025 at 5:07 PM Ivan Vecera <ivecera@...hat.com> wrote:
> > On 14. 04. 25 1:52 odp., Ivan Vecera wrote:
>
> ...
>
> > Long story short, I have to move virtual range outside real address
> > range and apply this offset in the driver code.
> >
> > Is this correct?
>
> Bingo!
>
> And for the offsets, you form them as "page number * page offset +
> offset inside the page".

Note, for easier reference you may still map page 0 to the virtual
space, but make sure that page 0 (or main page) is available outside
of the ranges, or i.o.w. ranges do not overlap the main page, even if
they include page 0.



-- 
With Best Regards,
Andy Shevchenko